Question about the combination of completionSize and completionTimeout.

Issue

• I have the following route

from("direct:start")
            .process(exchange -> {
                Message exchangeIn = exchange.getIn();
                exchangeIn.setHeader("_processID", UUID.randomUUID());
                exchangeIn.setHeader("_datCount", 4);
            })
            .split(body())
            .bean(myService, "doSomeThing")
            .aggregate(header("_processID"), new GroupedExchangeAggregationStrategy())
            .completionSize(header("_datCount"))
            .completionTimeout(20000)
            .process(exchange -> filterService.filter(BNYM));

• The reason I am using both completionSize and completionTimeout is something to do with the following scenario.
  • Say the split comes out with 100 threads and 2 of them failed during the myService.doSomeThing, I am assuming aggregate option completionSize set to 100 will never complete the aggregation. That is why I add completionTimeout to force the end of aggregation.
  • However, it looks like it will always wait 20 seconds even though all 100 threads are done correctly without any issue.
• Was there anything I did wrong?